IHC staining of Fth in rat maxillary third molar. Sagittal section of 4-week old rat maxillary molars stained with anti-Fth antibody and counterstained with hematoxylin. Panel A: Section of first, second and third molars observed under stereoscope with 16x magnification. Panel B: The third molar shown with 40x magnification. Panels C1 - C5: Regions identified as 1 - 5 in panel B are shown with 100x magnification. Panels D1 - D5: Ameloblasts and papillary layer cells, corresponding again to regions 1 - 5 indicated in panel B, are shown with 630x magnification. Ameloblasts (am) and papillary layer cells (pl) are labeled in panel D1. Scale bars: A and B, 1 mm; C1-C5 and D1-D5, 10 μm.